diff options
| -rw-r--r-- | arch/arm/cpu/armv7/mx6/clock.c | 75 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-mx6/clock.h | 1 |
2 files changed, 66 insertions, 10 deletions
diff --git a/arch/arm/cpu/armv7/mx6/clock.c b/arch/arm/cpu/armv7/mx6/clock.c index 5617a41..61f71cf 100644 --- a/arch/arm/cpu/armv7/mx6/clock.c +++ b/arch/arm/cpu/armv7/mx6/clock.c @@ -412,17 +412,12 @@ u32 imx_get_fecclk(void) return decode_pll(PLL_ENET, MXC_HCLK); } -int enable_sata_clock(void) +static int enable_enet_pll(uint32_t en) { - u32 reg = 0; - s32 timeout = 100000; struct mxc_ccm_reg *const imx_ccm = (struct mxc_ccm_reg *) CCM_BASE_ADDR; - - /* Enable sata clock */ - reg = readl(&imx_ccm->CCGR5); /* CCGR5 */ - reg |= MXC_CCM_CCGR5_SATA_MASK; - writel(reg, &imx_ccm->CCGR5); + s32 timeout = 100000; + u32 reg = 0; /* Enable PLLs */ reg = readl(&imx_ccm->analog_pll_enet); @@ -437,10 +432,70 @@ int enable_sata_clock(void) return -EIO; reg &= ~BM_ANADIG_PLL_SYS_BYPASS; writel(reg, &imx_ccm->analog_pll_enet); - reg |= BM_ANADIG_PLL_ENET_ENABLE_SATA; + reg |= en; writel(reg, &imx_ccm->analog_pll_enet); + return 0; +} - return 0 ; +static void ungate_sata_clock(void) +{ + struct mxc_ccm_reg *const imx_ccm = + (struct mxc_ccm_reg *)CCM_BASE_ADDR; + + /* Enable SATA clock. */ + setbits_le32(&imx_ccm->CCGR5, MXC_CCM_CCGR5_SATA_MASK); +} + +static void ungate_pcie_clock(void) +{ + struct mxc_ccm_reg *const imx_ccm = + (struct mxc_ccm_reg *)CCM_BASE_ADDR; + + /* Enable PCIe clock. */ + setbits_le32(&imx_ccm->CCGR4, MXC_CCM_CCGR4_PCIE_MASK); +} + +int enable_sata_clock(void) +{ + ungate_sata_clock(); + return enable_enet_pll(BM_ANADIG_PLL_ENET_ENABLE_SATA); +} + +int enable_pcie_clock(void) +{ + struct anatop_regs *anatop_regs = + (struct anatop_regs *)ANATOP_BASE_ADDR; + struct mxc_ccm_reg *ccm_regs = (struct mxc_ccm_reg *)CCM_BASE_ADDR; + + /* + * Here be dragons! + * + * The register ANATOP_MISC1 is not documented in the Freescale + * MX6RM. The register that is mapped in the ANATOP space and + * marked as ANATOP_MISC1 is actually documented in the PMU section + * of the datasheet as PMU_MISC1. + * + * Switch LVDS clock source to SATA (0xb), disable clock INPUT and + * enable clock OUTPUT. This is important for PCI express link that + * is clocked from the i.MX6. + */ +#define ANADIG_ANA_MISC1_LVDSCLK1_IBEN (1 << 12) +#define ANADIG_ANA_MISC1_LVDSCLK1_OBEN (1 << 10) +#define ANADIG_ANA_MISC1_LVDS1_CLK_SEL_MASK 0x0000001F + clrsetbits_le32(&anatop_regs->ana_misc1, + ANADIG_ANA_MISC1_LVDSCLK1_IBEN | + ANADIG_ANA_MISC1_LVDS1_CLK_SEL_MASK, + ANADIG_ANA_MISC1_LVDSCLK1_OBEN | 0xb); + + /* PCIe reference clock sourced from AXI. */ + clrbits_le32(&ccm_regs->cbcmr, MXC_CCM_CBCMR_PCIE_AXI_CLK_SEL); + + /* Party time! Ungate the clock to the PCIe. */ + ungate_sata_clock(); + ungate_pcie_clock(); + + return enable_enet_pll(BM_ANADIG_PLL_ENET_ENABLE_SATA | + BM_ANADIG_PLL_ENET_ENABLE_PCIE); } unsigned int mxc_get_clock(enum mxc_clock clk) diff --git a/arch/arm/include/asm/arch-mx6/clock.h b/arch/arm/include/asm/arch-mx6/clock.h index e31ba0a..1b4ded7 100644 --- a/arch/arm/include/asm/arch-mx6/clock.h +++ b/arch/arm/include/asm/arch-mx6/clock.h @@ -55,6 +55,7 @@ unsigned int mxc_get_clock(enum mxc_clock clk); void enable_ocotp_clk(unsigned char enable); void enable_usboh3_clk(unsigned char enable); int enable_sata_clock(void); +int enable_pcie_clock(void); int enable_i2c_clk(unsigned char enable, unsigned i2c_num); void enable_ipu_clock(void); int enable_fec_anatop_clock(enum enet_freq freq); |